Volcanoes, landslides, snow avalanches, earthquakes, wildfires and other geophysical phenomena produce sounds well below the range of human hearing — otherwise known as infrasound. But just because ...

Shishaldin volcano, a 9,373-foot stratovolcano on Unimak Island at the eastern end of Alaska’s Aleutian chain, has been producing persistent seismic tremor, frequent infrasound signals, and elevated ...

First things first — everything is normal. Mount Rainier is not about to erupt. Today, at least. (The future is another story). Got it? OK, good. Now that is out of the way, the Cascades Volcano ...